WO2011137778A1 - 数据传输方法和系统 - Google Patents

数据传输方法和系统 Download PDF

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Publication number
WO2011137778A1
WO2011137778A1 PCT/CN2011/074180 CN2011074180W WO2011137778A1 WO 2011137778 A1 WO2011137778 A1 WO 2011137778A1 CN 2011074180 W CN2011074180 W CN 2011074180W WO 2011137778 A1 WO2011137778 A1 WO 2011137778A1
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WO
WIPO (PCT)
Prior art keywords
user terminal
cell
micro
macro
macro cell
Prior art date
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Ceased
Application number
PCT/CN2011/074180
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English (en)
French (fr)
Inventor
杜颖钢
刘晟
王锐
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP11777197.2A priority Critical patent/EP2549827B1/en
Publication of WO2011137778A1 publication Critical patent/WO2011137778A1/zh
Priority to US13/624,369 priority patent/US9020438B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a data transmission method and system. Background technique
  • macro base stations and micro base stations can be roughly divided.
  • the area covered by the macro base station is called a macro cell ( Macro-cell )
  • the area covered by the micro base station is called a pico-cell.
  • neighboring base stations can simultaneously cover the cell edge of the neighboring cell, there are also equal power interferences of neighboring base stations at the cell edge of the neighboring cell, and the call effect and data rate of the user terminal in the area are both affected.
  • the more traditional methods usually passively improve the interference performance by means of interference suppression, frequency orthogonalization, soft frequency multiplexing or adding mobile phone receiving antennas, in order to more effectively utilize the power of neighboring base stations, between adjacent base stations.
  • Collaborative delivery is receiving more and more attention from academia and industry.
  • HetNet Heterogeneous Network
  • the embodiments of the present invention provide a data transmission method and system, which are used to solve the defect that the system capacity increase is limited due to the inability to implement real-time joint processing between the base stations in the prior art, and realize the resources between the macro base station and the micro base station. Joint scheduling reduces inter-cell interference and maximizes overall data rates.
  • the embodiment of the present invention provides a data transmission method, which is applied to a system architecture that adopts a virtual multi-layer cell structure, where a macro base station covering a macro cell and a micro base station covering a micro cell share a site, the method includes the following steps:
  • the embodiment of the present invention provides a data transmission system, which is applied to a system architecture that adopts a virtual multi-layer cell structure, where a macro base station covering a macro cell and a micro base station covering a micro cell share a site, the data transmission system includes:
  • a sending module configured to send control information and data information to the macro cell and the user terminal of the micro cell according to the location information of the user terminal, so that the user terminal obtains the data information according to the control information.
  • the data transmission method and system of the embodiment of the present invention by setting the micro base station and the macro base station as a co-site address, the macro base station and the micro base station can perform unified scheduling on the user terminal, and according to the location information of the user terminal, the macro cell and the micro cell
  • the user terminal of the area sends the control information and the data information to realize the joint transmission of the information of the macro base station and the micro base station to the user terminal, and realizes the joint scheduling of the communication resources of the user terminal between the macro base station and the micro base station, and solves the existing existing
  • the shortcomings of system capacity increase caused by joint processing cannot be implemented between base stations, which breaks the limitation of backhaul capability and the limitation of synchronization requirements, thereby reducing inter-cell interference and maximizing the overall data rate.
  • FIG. 1 is a schematic structural diagram of a system of V-HetNet according to Embodiment 1 of the data transmission method of the present invention
  • FIG. 2 is a flowchart of Embodiment 2 of a data transmission method according to the present invention
  • FIG. 3 is a schematic structural diagram of a system of V-HetNet in the second embodiment of the data transmission method according to the present invention
  • FIG. 4 is a schematic flowchart of data precoding and transmission in the second embodiment of the data transmission method according to the present invention
  • FIG. 5 is a schematic structural diagram of an embodiment of a data transmission system according to the present invention. detailed description
  • FIG. 1 is a V-HetNet in the first embodiment of the data transmission method of the present invention.
  • the system may include a macro base station, a micro base station, a macro cell, and a micro cell.
  • the macro cell is a cell covered by the macro base station
  • the micro cell is a cell covered by the micro base station.
  • the macro base station and the micro base station in the embodiment are co-sites.
  • the so-called co-site address refers to adding an antenna group to the site where the macro base station is located, and the antenna group is interconnected with the original macro base station by using an optical fiber.
  • the group forms a coverage of the micro-region by means of beamforming,
  • the body assumes the function of the micro base station. Therefore, the baseband system between the base station and the micro base station in this embodiment can be shared, and channel information and data information can be shared between the two, and in a common area covered by the macro base station and the micro base station, that is, tiny.
  • the macro base station and the micro base station can simultaneously reach each terminal in the area, so that the macro base station can complete the unified scheduling.
  • the method provided in this embodiment may include the following steps:
  • the base station sends control information and data information to the user terminals of the macro cell and the micro cell according to the location information of the user terminal, so that the user terminal acquires corresponding data information according to the received control information.
  • the location information of the user terminal in this embodiment is a specific location of the user terminal in the macro cell or the micro cell, and may be a location in the macro cell relative to the micro cell, or in the micro cell relative to the macro cell. position.
  • the macro base station and the micro base station in the embodiment are co-sites, and the two can perform unified scheduling on the user terminals in the macro cell and the micro cell. When scheduling the user terminal, the scheduling is performed according to the location thereof.
  • the control information and the data information are transmitted to the user terminal according to the location information of the user terminal. After receiving the control information sent by the base station, the user terminal may obtain the corresponding data information according to the control information.
  • the macro base station and the micro base station are co-sited, it indicates that the macro base station and the micro base station can maintain strict synchronization, so that the signal sent by the macro base station and the micro base station reaches the terminal synchronization, completely avoiding the micro cell and the micro cell. Interference between each control channel or data channel when the macro cell transmits control information or data information.
  • the embodiment provides a data transmission method.
  • the macro base station and the micro base station are uniformly scheduled by the macro base station and the micro base station, and the user terminal is uniformly scheduled according to the location information of the user terminal, and the macro cell and the micro cell are arranged according to the location information of the user terminal.
  • the user terminal sends control information and data information to realize joint transmission of information between the macro base station and the micro base station to the user terminal, and realizes joint scheduling of communication resources between the macro base station and the micro base station to the user terminal, and solves the prior art.
  • the limitation of limited system capacity increase caused by the joint processing cannot be implemented among the base stations, which breaks the limitation of the backhaul capability and the limitation of the synchronization requirement, thereby reducing inter-cell interference and maximizing the overall data rate.
  • Step 201 The base station acquires communication state information of the user terminal in the macro cell and the micro cell, and the base station in this step is specifically a macro base station.
  • the user terminal Before a data transmission is performed, when a user needs to call another user terminal through its user terminal, or send or receive a short message or perform other communication services to other user terminals, the user terminal first sends a service request to the corresponding base station. Specifically, the user terminal in the macro cell sends a service request to the macro base station, and the user terminal in the micro cell sends a service request to the micro base station, where the service request carries the communication status information of the corresponding user terminal.
  • the communication status information herein may specifically be related information indicating the current communication status of the user terminal, such as information of another terminal that the user terminal wants to call or send a short message.
  • the macro base station can obtain the communication state from the micro base station through the optical fiber connected to the micro base station. Information, and the communication status information of the user terminal of the macro cell is directly received by the macro base station.
  • Step 202 The base station acquires location information of the user terminal in the macro cell and the micro cell, and the base station in this step is specifically a macro base station.
  • FIG. 3 is a schematic structural diagram of a system of a V-HetNet according to Embodiment 2 of the data transmission method of the present invention.
  • a coverage area of a base station is divided into a central area of a micro area and an edge area of a micro area.
  • the coverage area of the macro base station is also divided into two parts: a central area of the macro cell and an edge area of the macro cell.
  • the edge area and the central area of the macro cell are relative to the micro cell, the edge area of the macro cell is the area near the boundary between the macro cell and the micro cell, and the remaining area of the macro cell is the opposite center area.
  • the boundary between the central area and the edge area of the micro cell may be dynamically adjusted by the macro base station according to the load condition in the macro cell and/or the micro cell.
  • the dividing line is set inward, that is, the central area is set smaller; when the number of user terminals in the micro area is small, the dividing line can be set outward, that is, the central area is set larger to accommodate more
  • the number of specific user terminals can also be set according to actual conditions.
  • the macro base station can obtain the specific location information of the user terminal in the macro cell and the micro cell, and the location information can be obtained by the user terminal reporting to the base station, where the macro base station includes the macro cell and the micro cell.
  • the location information herein may be that the user terminal is located in a central area or an edge area of the macro cell, or the user terminal is located in a central area or an edge area of the micro cell.
  • Step 203 The base station performs unified scheduling on the communication resources of the user equipment in the macro cell and the micro cell according to the communication state information, and the base station in this step is specifically a macro base station.
  • the communication resources of the user terminals in the micro cell and the macro cell are uniformly scheduled by referring to the communication state information of the different user terminals.
  • the communication resources herein may include bandwidth information, subcarrier information, modulation information, and the like used for data transmission.
  • the macro base station aggregates the communication resources of the user terminals in the macro cell and the micro cell, performs unified management and scheduling of the communication resources, uniformly allocates communication resources, and uniformly coordinates the transmission mode.
  • the macro base station may specifically allocate different communication resources according to different communication state information currently corresponding to different user terminals, and generate corresponding scheduling results. If a communication service to be performed by a user terminal is complicated, it can allocate more communication resources to it, and vice versa.
  • Step 204 The base station sends control information and data information to the user terminals in the macro cell and the micro cell according to the location information and the scheduling result of the user terminal.
  • the base station in this step is specifically a macro base station and/or a micro base station.
  • the macro base station may uniformly send control information to the user terminals in the macro cell and the micro cell according to the location information and the scheduling result of the user terminal, and the macro base station may specifically adopt the frequency division manner. Control the transmission of information. That is, the user terminal in the macro cell and the user terminal in the micro cell occupy a part of the spectrum respectively, where the user terminal in the macro cell occupies the first transmission spectrum, and the user terminal in the micro cell occupies the second transmission spectrum as an example, where The first transmission medium and the second transmission medium are orthogonal to each other, that is, there is no overlapping spectrum between the first transmission medium and the second transmission medium.
  • the first transmission frequency and the second transmission spectrum may be respectively a spectrum range, and may be occupied by multiple user terminals in a macro cell or a micro cell. Transmission with one transmission frequency can also be performed for multiple user terminals occupying multiple transmission frequencies.
  • the macro base station sends the corresponding control information to the user terminal in the macro cell by using the first transmission spectrum
  • the macro base station sends the corresponding control information to the user terminal in the micro cell by using the second transmission spectrum to implement the micro area and the macro.
  • the communication resources occupied by the user terminals in the cell are orthogonal in the frequency domain.
  • the control information of the user terminal in the macro cell and the micro cell are coordinated and transmitted by the macro base station, and the control information can be synchronously arrived at each user terminal in the macro cell and the micro cell, and the coverage of the micro base station is completely Within the coverage of the macro base station, it is ensured that the user terminal in the micro cell can receive the control information of the macro base station, and the interference between the micro cell and the control channel of the macro cell is completely avoided.
  • the data transmission method in this embodiment may be specifically applied to scenarios in which the number of micro cells is small (for example, 1-3). When the number of micro cells is large, the base station scheduling in the prior art may be used to manually The transmission mode of the control information of the area will not be described here.
  • the control channel of the micro cell needs to be appropriately processed, for example, the cell number of the micro cell can be utilized.
  • the control information carried by the control channel is scrambled to be distinguished from the control information carried by the control channel of the macro cell.
  • all user terminals in the macro cell range may be uniformly numbered. If the user terminal in the micro cell is also in the macro cell range, the user terminals in the macro cell and the micro cell are uniformly numbered together.
  • the macro base station or the micro base station does not cause the erroneous reception due to the same number of the user terminals in different cells when performing the scheduling of the user terminal.
  • the probability of false reception is greatly reduced, so there is no need to perform scrambling.
  • the macro base station and the micro base station may send data information to the macro cell and the user terminal in the micro cell according to the specific location of the user terminal.
  • the step is specifically: when the user terminal in the micro cell is located in the central area of the micro cell, or the user terminal in the macro cell is located in the central area of the macro cell, the macro base station and the micro base station respectively send the macro by using the same sending resource.
  • the data information of the user terminal in the cell and the user terminal in the micro cell, that is, the macro base station directly uses the same transmission resource as the transmission resource of the user terminal in the macro cell.
  • the data information of the user terminal in the micro cell is transmitted.
  • the macro base station and the micro base station may respectively send data information of the user terminals in the macro cell and the micro cell by using the same transmission frequency.
  • the difference between the beam strength of the micro cell and the beam strength of the macro cell is large, and the user terminal in the micro cell can directly treat the signal sent by the macro base station as noise, so
  • the beam of the micro cell itself may be scheduled to be transmitted, and the transmission resource of the part of the user terminal in the micro cell may completely coincide with the transmission resource of the macro cell, both in time and in frequency.
  • the user terminal in the macro cell can directly treat the signal sent by the micro base station as noise, and only needs to schedule the beam of the macro cell itself to transmit, whether in time or not.
  • the transmission resources of the part of the user terminals in the macro cell may also completely overlap with the transmission resources of the micro cell. Therefore, in this embodiment, the macro base station uses the same transmission resource to separately transmit data information of the user terminal in the macro cell and the micro cell.
  • the specific step may be that when the user terminal in the micro cell is located in the central area of the micro cell, and the user terminal in the macro cell is located in the central area of the macro cell, or may be located in the micro cell in the micro cell.
  • the macro base station and the micro base station respectively transmit the data information of the user terminal in the macro cell and the user terminal in the micro cell by using the same transmission resource.
  • the user terminal in the micro cell when the data information is transmitted, when the user terminal in the micro cell is located in the edge region of the micro cell, and the user terminal in the macro cell is located in the edge region of the macro cell, the user terminal in the micro cell The distance from the user terminal in the macro cell is relatively close.
  • the macro base station and the micro base station pass the antenna group of the macro cell and the antenna group of the micro cell, regardless of the user terminal in the macro cell or the user terminal in the micro cell.
  • the codebook jointly pre-codes and transmits data carried by the data channel of the user terminal in the macro cell and/or the user terminal in the micro cell.
  • the macro base station and the micro base station perform unified scheduling on the antenna group of the macro cell and the antenna group of the micro cell, and jointly pre-code and transmit the data carried by the data channel of the user terminal by using the same set of codebooks.
  • the macro base station and the micro base station may perform data transmission for each user terminal according to a specific scheduling policy.
  • a scheduling, specifically, the data joint transmission scheme in this embodiment may be multiple input multiple output (Multiple Input Multiple Output; below) for the user terminal in the macro cell and the data transmission of the user terminal in the micro cell simultaneously (Multiple Input Multiple Output;
  • MIMO scheme which may also be a single-user terminal MIMO scheme for simultaneously transmitting data of a user terminal in a macro cell or a user terminal in a micro cell, or may be a user terminal in a macro cell or a user terminal in a micro cell.
  • the antenna group of the macro cell and the antenna group of the micro cell in the foregoing step use a unified codebook to jointly pre-code and transmit data information of the user terminal in the macro cell and/or the micro cell.
  • the process may include the following steps: First, the macro base station or the base station uses a unified codebook to precode data carried by the user terminal in the macro cell and/or the data channel of the user terminal in the micro cell to generate coded data.
  • the stream, the number of dimensions of the encoded data stream is equal to the maximum number of data streams accommodated by the codebook.
  • the antenna group of the macro base station is composed of M antennas
  • the antenna group of the base station is composed of N antennas
  • M and N are both positive integers.
  • a single beam is usually used to transmit data in the micro area, and the signal-to-noise ratio is high. Higher modulation is used to achieve throughput improvement.
  • the maximum number of data streams that can be accommodated according to the codebook specified in the protocol is assumed to be T, where T is a positive integer, and T is less than or equal to M+N, assuming that the data channel of the user terminal is to be transmitted.
  • the number of data streams is L, where L is a positive integer and L is less than or equal to T.
  • 4 is a schematic flowchart of data precoding and sending in the second embodiment of the data transmission method of the present invention. As shown in FIG. 4, in this embodiment, data of the same set of codebooks for user terminals in the macro cell and/or the micro cell may be used.
  • the data to be transmitted carried on the channel is precoded, and the specific macro base station or the micro base station may precode the L data streams to be transmitted through the LxT precoding matrix to generate a T-dimensional encoded data stream.
  • the macro base station or the micro base station The encoded data stream is mapped to an antenna group of the macro cell and an antenna of the antenna group of the micro cell by using an antenna conversion matrix for transmission.
  • the macro base station or the micro base station maps the T-dimensional pre-coded encoded data stream to the M+N antennas according to the antenna conversion matrix, ie, matrix ⁇ ( ⁇ + ⁇ ), using M +N antennas transmit the encoded data stream.
  • the antenna transformation matrix ⁇ ⁇ ( ⁇ + ⁇ ) is obtained by extracting the ⁇ column in the D ⁇ matrix of the ( ⁇ + ⁇ ) dimension.
  • the antenna transformation matrix is the unit matrix of the dimension.
  • the macro base station or the micro base station combines the antennas in the macro cell and the micro cell, and integrates the transmission capability, so that the entire resource of the macro cell and the micro cell is used to transmit a single or multiple user terminals. The data.
  • the macro base station may also combine the antenna of the macro cell and the equivalent beam of the micro cell to unit the received data stream. decoding. Moreover, since the macro base station and the micro base station are directly connected by the optical fiber, there is almost no delay problem between the two, and the macro base station can effectively simultaneously transmit the data sent by the user terminal in the macro cell and the user terminal in the micro cell. Receiving, and then distinguishing different cells according to information such as a cell number.
  • the data beams are respectively sent to the user terminal of the macro cell and the user terminal of the micro cell by using mutually orthogonal transmit beams to avoid mutual Cause interference between.
  • the user terminal in the macro cell may be scheduled according to the location of the user terminal in the micro cell, and the data information of the scheduled user terminal is transmitted.
  • the data beam is transmitted to the user terminal in the macro cell by using a transmission beam orthogonal to the beam used when transmitting the data information to the user terminal in the micro cell.
  • the macro base station can perform beam coordination according to the location of the micro cell when scheduling the user terminal in the macro cell, and avoid scheduling the user terminal in the direction of the micro cell as much as possible.
  • the terminal 1 is located in the edge area of the micro cell.
  • the macro base station sends the data information to the user terminal in the macro cell, that is, to the user terminal in the macro cell, the transmission beam corresponding to the terminal 1 is orthogonally selected. Transmit beam to send data information, that is, try to select terminal 2 in the scheduling map instead of scheduling Terminal 3 in the figure, so as not to interfere with terminal 1 in the micro cell.
  • the user terminal in the micro cell can directly occupy a single one-dimensional space. If there are two micro cells, and the two micro cells are close to each other, the side lobes may interfere with the adjacent micro cells. At this time, the macro base station can uniformly schedule the two micro cells, a simple approach. You can turn off one of the micro cells first and send them separately in time or frequency.
  • the joint transmission process in this embodiment can only be performed by one micro cell and the macro cell, because the macro cell and the micro cell are combined. After the transmission mode, including the precoding method and the resource block information, the possibility of continuing joint transmission with other micro cells is lacking, but the possibility of beam coordination with other micro cells is not excluded.
  • Step 205 The user terminal acquires corresponding data information according to the received control information.
  • the user terminal located in the macro cell or the micro cell After receiving the control information sent by the base station, the user terminal located in the macro cell or the micro cell obtains the subcarrier information, channel information, and the like indicated by the control information by parsing the control information. This step is a technique familiar to those skilled in the art and will not be described herein.
  • the embodiment provides a data transmission method.
  • the macro base station and the micro base station perform unified coordinated scheduling on the user terminal, and according to the location information of the user terminal, the macro cell and the micro cell are
  • the user terminal of the area sends the control information and the data information to realize the joint transmission of the information of the macro base station and the micro base station to the user terminal, and realizes the joint scheduling of the communication resources of the user terminal between the macro base station and the micro base station, and solves the existing existing
  • the base station can not implement the limitation of limited system capacity increase caused by joint transmission, which breaks the limitation of backhaul capability and the limitation of synchronization requirements, thereby reducing inter-cell interference and maximizing the overall data rate.
  • the data transmission system provided by the present embodiment can be applied to a system architecture adopting a virtual multi-layer cell structure, wherein a macro base station covering a macro cell and a micro base station covering a micro cell share a site address.
  • the data transmission system provided by this implementation may specifically include a sending module.
  • the sending mode is configured to send control information and data information to the macro cell and the user terminal of the micro cell according to the location information of the user terminal, so that the user terminal acquires the data information according to the control information.
  • FIG. 5 is a schematic structural diagram of an embodiment of a data transmission system according to the present invention. As shown in FIG. 5, the embodiment provides a data transmission system, which can specifically perform the steps in the second embodiment of the foregoing method, and details are not described herein again.
  • the sending module 501 in the data transmission system provided in this embodiment may specifically include a first sending unit 51 1 and a second sending unit 521.
  • the first sending unit 51 1 is configured to send corresponding control information to the user terminal in the macro cell by using the first transmit spectrum.
  • the second sending unit 521 is configured to send the corresponding control information to the user terminal in the micro cell by using the second transmit spectrum.
  • the first transmission medium and the second transmission medium are orthogonal to each other.
  • the sending module 501 in the data transmission system provided in this embodiment may further include a third sending unit 531, where the third sending unit 531 is configured to locate a user terminal in the micro cell in a central area of the micro cell. Or, when the user terminal in the macro cell is located in the central area of the macro cell, the data information of the user terminal in the macro cell and the user terminal in the activated cell are respectively sent by using the same sending resource.
  • the sending module 501 in the data transmission system provided in this embodiment may further include a fourth sending unit 541, where the fourth sending unit 541 is configured to: when the user terminal in the micro cell is located in an edge region of the micro cell, And when the user terminal in the macro cell is located in an edge region of the macro cell, the macro cell and/or the micro cell are adopted by using an antenna group of the macro cell and an antenna group of the micro cell.
  • the data information of the user terminal in the zone may further include a fourth sending unit 541, where the fourth sending unit 541 is configured to: when the user terminal in the micro cell is located in an edge region of the micro cell, And when the user terminal in the macro cell is located in an edge region of the macro cell, the macro cell and/or the micro cell are adopted by using an antenna group of the macro cell and an antenna group of the micro cell.
  • the data information of the user terminal in the zone may further include a fourth sending unit 541, where the fourth sending unit 541 is configured to: when the user terminal in the micro cell is located in an edge region of the micro
  • the fourth sending unit 541 in the data transmission system provided in this embodiment may specifically include a precoding subunit 5411 and a transmitting subunit 5412.
  • the precoding sub-unit 541 1 is configured to use the same codebook to perform data information of the user terminal in the macro cell and/or the micro cell. Precoding, generating an encoded data stream, the number of dimensions of the encoded data stream being equal to the maximum number of data streams accommodated by the codebook.
  • the transmitting subunit 5412 is configured to map the encoded data stream to an antenna group of the macro cell and an antenna in an antenna group of the micro cell by using an antenna conversion matrix for transmission.
  • the sending module 501 in the data transmission system provided in this embodiment may further include a fifth sending unit 551, where the fifth sending unit 551 is configured to use each other when the user terminal of the micro cell is in an edge region of the micro cell.
  • the orthogonal transmit beams respectively transmit data information to the user terminals of the macro cell and the user terminals of the micro cell.
  • the data transmission system provided in this embodiment may further include an adjustment module 502, where the adjustment module 502 is configured to view a central area and an edge of the micro cell according to a load condition in the macro cell and/or the micro cell. The boundaries between the areas are adjusted.
  • the adjustment module 502 is configured to view a central area and an edge of the micro cell according to a load condition in the macro cell and/or the micro cell. The boundaries between the areas are adjusted.
  • the data transmission system provided in this embodiment may further include an acquisition scheduling module 503, where the acquisition scheduling module 503 is configured to acquire communication state information of the macro cell and the user terminal of the micro cell, according to the communication state. The information is uniformly scheduled for the communication resources of the user terminal.
  • the embodiment provides a data transmission system.
  • the macro base station and the macro base station are configured to be co-sites, and the macro base station and the micro base station perform unified scheduling on the user terminal, and according to the location information of the user terminal, the macro cell and the micro cell are configured.
  • the user terminal sends control information and data information to realize joint transmission of information between the macro base station and the micro base station to the user terminal, and realizes joint scheduling of communication resources between the macro base station and the micro base station to the user terminal, and solves the prior art.
  • the limitation of limited system capacity increase caused by the joint processing cannot be implemented among the base stations, which breaks the limitation of the backhaul capability and the limitation of the synchronization requirement, thereby reducing inter-cell interference and maximizing the overall data rate.

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Description

数据传输方法和系统
本申请要求于 2010 年 09 月 21 日提交中国专利局、 申请号为 201010292515. 5 , 发明名称为 "数据传输方法和系统" 的中国专利申请的优 先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明实施例涉及通信技术， 尤其涉及一种数据传输方法和系统。 背景技术
随着无线通信技术的发展和手机的大量普及， 基站设备已在城市乡村随 处可见， 根据基站间的距离大体可以分为宏基站和微基站， 其中， 宏基站所 覆盖的区域称为宏小区 （Macro-cell ) , 微基站所覆盖的区域称为微小区 ( Pico-cell )。 为了保证连续覆盖， 在相邻基站可以同时覆盖相邻小区的小区 边缘， 则在相邻小区的小区边缘也存在相邻基站的等功率干扰， 该区域的用 户终端的通话效果和数据速率均会受到影响。 而比较传统的方法通常通过干 扰抑制、 频率正交化、 软频率复用或增加手机接收天线等方式来被动式地改 善干扰性能， 为了更有效地利用相邻基站的功率， 相邻基站之间的协作发送 越来越受到学术界和工业界的重视。
在现有技术的第三代合作伙伴（3rd Generation Partnership Project; 以下 简称： 3GPP )标准中， 多层小区结构 （Heterogeneous Network; 以下简称： HetNet ) 利用宏小区实现某区域的无缝连续覆盖， 再在热点处采用微小区重 叠覆盖， 微小区针对热点处较大的业务量需求， 提供较高的容量， 从而实现 系统容量的 "按需分配" 。
然而， 现有技术中由于回传 （Backhaul ) 能力的限制和同步性的要求限 制， 各基站间不能实施实时的联合传输来实现资源调度与干扰管理， 系统的 容量提升受到限制。 发明内容
本发明实施例提供一种数据传输方法和系统，用以解决现有技术中各 基站间无法实施实时联合处理所造成的系统容量提升受限的缺陷，实现宏基 站与微基站之间的资源的联合调度， 降低小区间干扰， 最大限度地提高总体 的数据率。
本发明实施例提供一种数据传输方法， 应用于采用虚拟多层小区结构的 系统架构， 其中， 覆盖宏小区的宏基站与覆盖微小区的微基站共站址， 所述 方法包括如下步骤：
根据用户终端的位置信息向所述宏小区和所述微小区的用户终端发送控 制信息和数据信息 ,使得所述用户终端根据所述控制信息获取所述数据信息。
本发明实施例提供一种数据传输系统， 应用于采用虚拟多层小区结构的 系统架构， 其中， 覆盖宏小区的宏基站与覆盖微小区的微基站共站址， 所述 数据传输系统包括：
发送模块， 用于根据用户终端的位置信息向所述宏小区和所述微小区的 用户终端发送控制信息和数据信息 , 使得所述用户终端根据所述控制信息获 取所述数据信息。
本发明实施例的数据传输方法和系统， 通过将微基站与宏基站设置为共 站址， 可以由宏基站和微基站对用户终端进行统一调度， 根据用户终端的位 置信息来向宏小区和微小区的用户终端发送控制信息以及数据信息， 以实 现宏基站和微基站对用户终端的信息的联合传输， 实现了宏基站与微基站 之间对用户终端的通信资源的联合调度，解决了现有技术中各基站间无法 实施联合处理所造成的系统容量提升受限的缺陷，打破了回传能力的限制 和同步要求的限制， 从而降低了小区间干扰， 最大限度地提高了总体的数 据率。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍， 显而易见地， 下 面描述中的附图是本发明的一些实施例， 对于本领域普通技术人员来讲， 在 不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明数据传输方法实施例一中 V-HetNet的系统结构示意图； 图 2为本发明数据传输方法实施例二的流程图；
图 3为本发明数据传输方法实施例二中 V-HetNet的系统结构示意图； 图 4 为本发明数据传输方法实施例二中数据预编码及发送的流程示意 图；
图 5为本发明数据传输系统实施例的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于 本发明中的实施例， 本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
本实施例提供一种数据传输方法， 该方法可以具体采用虚拟多层小区结 构 （ Virtual HetNet; 以下简称： V-HetNet ) 的系统架构， 图 1为本发明数据 传输方法实施例一中 V-HetNet的系统结构示意图， 如图 1所示， 该系统可以 包括宏基站、 微基站、 宏小区和微小区。 其中， 宏小区为宏基站覆盖的小区， 微小区为微基站覆盖的小区。 本实施例中的宏基站和微基站共站址， 此处所 谓的共站址是指在宏基站所在的站址上增加一个天线组， 该天线组与原宏基 站通过光纤互连， 该天线组通过波束合成的方式形成对微小区的覆盖， 来具 体承担微基站的功能。 因此， 本实施例中的基站与微基站之间的基带系统能 够共用， 可以实现两者之间的信道信息和数据信息的共享， 而且在宏基站和 微基站所覆盖的共同区域内， 即微小区中的用户终端， 宏基站与微基站可以 同时达到该区域中的各终端， 因而可以由宏基站来完成统一调度。
本实施例提供的方法可以具体包括如下步骤： 基站根据用户终端的位置 信息向宏小区和微小区的用户终端发送控制信息和数据信息， 使得用户终端 根据接收到的控制信息来获取对应的数据信息。 本实施例中所指的用户终端 的位置信息为用户终端在宏小区或微小区中的具体位置， 可以为其在宏小区 中相对于微小区的位置， 或在微小区中相对于宏小区的位置。 本实施例中的 宏基站和微基站共站址， 二者可以对宏小区和微小区中的用户终端进行统一 调度， 在对用户终端进行调度时， 具体根据其所处的位置来调度， 即根据用 户终端的位置信息向用户终端发送控制信息以及数据信息。 当用户终端接收 到基站发送的控制信息后，可以根据控制信息来具体获取其对应的数据信息。
在本实施例中， 由于宏基站与微基站共站址， 则表明宏基站与微基站可 以保持严格的同步， 使得宏基站与微基站发出的信号到达终端的同步， 完全 避免了向微小区与宏小区发送控制信息或数据信息时各控制信道或数据信道 之间的干扰。
本实施例提供了一种数据传输方法， 通过将微基站与宏基站设置为共站 址， 由宏基站和微基站对用户终端进行统一调度， 根据用户终端的位置信息 来向宏小区和微小区的用户终端发送控制信息以及数据信息， 以实现宏基站 和微基站对用户终端的信息的联合传输， 实现了宏基站与微基站之间对用户 终端的通信资源的联合调度， 解决了现有技术中各基站间无法实施联合处理 所造成的系统容量提升受限的缺陷， 打破了回传能力的限制和同步要求的限 制， 从而降低了小区间干扰， 最大限度地提高了总体的数据率。
图 2为本发明数据传输方法实施例二的流程图， 如图 2所示， 本实施例 提供了一种数据传输方法， 可以具体采用 V-HetNet的系统架构， 且宏基站和 微基站共站址， 本实施例提供的数据传输方法可以具体包括如下步骤： 步骤 201 , 基站获取宏小区和微小区中用户终端的通信状态信息， 本步 骤中的基站具体为宏基站。
在进行数据传输之前， 当某用户需要通过其用户终端呼叫另外一个用户 的用户终端，或者向其他用户终端发送或接收短消息或进行其他通信业务时， 用户终端先向对应的基站发送业务请求， 具体可以为宏小区中的用户终端向 宏基站发送业务请求， 微小区中的用户终端向微基站发送业务请求， 业务请 求中携带对应用户终端的通信状态信息。 此处的通信状态信息可以具体为指 示该用户终端当前通信状态的相关信息， 如可以包括该用户终端所要呼叫或 发送短消息等的另一个终端的信息。由于本实施例中微基站与宏基站共站址， 则微小区的用户终端的通信状态信息在发送到微基站上后， 宏基站通过与微 基站相连的光纤可以从微基站获取到其通信状态信息， 而宏小区的用户终端 的通信状态信息则由宏基站直接接收得到。
步骤 202, 基站获取宏小区和微小区中用户终端的位置信息， 本步骤中 的基站具体为宏基站。
宏基站除了获取宏小区和微小区中用户终端的通信状态信息夕卜，宏基站还 获取宏小区和微小区中用户终端的位置信息。图 3为本发明数据传输方法实施 例二中 V-HetNet的系统结构示意图， 如图 3所示， 本实施例中具体将 基站 的覆盖区域分为微小区的中心区域和微小区的边缘区域两部分， 相应地， 也将 宏基站的覆盖区域分为宏小区的中心区域和宏小区的边缘区域两部分。 其中， 宏小区的边缘区域和中心区域是相对于微小区而言的，宏小区的边缘区域为宏 小区与微小区交界附近的区域，宏小区的其余区域则为相对的中心区域。 具体 地， 微小区的中心区域与边缘区域之间的分界线可以由宏基站根据宏小区和 / 或微小区中的负载情况来动态调整， 当微小区中用户终端的数量较多时， 可以 将该分界线向里设置， 即将中心区域设置得小一些； 当微小区中用户终端的数 量较少时， 可以将该分界线向外设置， 即将中心区域设置得大一些， 以容纳更 多的用户终端， 具体的用户终端的数量也可以根据实际情况而设定。 由于宏基 站所覆盖的区域包含宏小区和微小区，则宏基站可以获取到宏小区和微小区中 用户终端的具体位置信息，具体可以通过由用户终端向基站上报的方式来获取 其位置信息，此处的位置信息可以为该用户终端位于宏小区的中心区域或边缘 区域， 或用户终端位于微小区的中心区域或边缘区域。
步骤 203 , 基站根据通信状态信息对宏小区和微小区中用户终端的通信 资源进行统一调度， 本步骤中的基站具体为宏基站。
在宏基站获取到各用户终端的通信状态信息后，参照不同用户终端的通信 状态信息， 对微小区和宏小区中用户终端的通信资源进行统一调度。 此处的通 信资源可以包括数据传输所使用的带宽信息、 子载波信息、 调制信息等等。 本 实施例由宏基站将宏小区和微小区中用户终端的通信资源集合在一起，对通信 资源进行统一管理和调度， 统一分配通信资源， 统一协调发送模式等。 在进行 调度时，宏基站具体可以根据不同用户终端当前对应的不同通信状态信息， 来 为其分配不同的通信资源， 并生成相应的调度结果。 如某个用户终端所要执行 的通信业务较复杂， 则可以为其分配较多的通信资源等， 反之亦然。
步骤 204 , 基站根据用户终端的位置信息和调度结果向宏小区和微小区 中的用户终端发送控制信息和数据信息， 本步骤中的基站具体为宏基站和 /或 微基站。
本步骤中， 当进行控制信息的传输时， 可以具体由宏基站根据用户终端 的位置信息和调度结果向宏小区和微小区中的用户终端统一发送控制信息， 宏基站可以具体采用频分方式进行控制信息的传输。 即宏小区中的用户终端 和微小区中的用户终端分别占用一部分频谱， 此处以宏小区中的用户终端占 用第一发送频谱， 微小区中的用户终端占用第二发送频谱为例进行说明， 其 中， 第一发送频媒与第二发送频媒相互正交， 即第一发送频媒与第二发送频 媒之间不存在重叠的频谱。 需要指出的是， 此处的第一发送频媒和第二发送 频谱可以分别为一个频谱范围， 可以为宏小区或微小区中的多个用户终端占 用一个发送频率进行传输， 也可以为多个用户终端占用多个发送频率进行传 输。 本步骤具体为宏基站采用第一发送频谱向宏小区中的用户终端发送对应 的控制信息， 宏基站采用第二发送频谱向微小区中的用户终端发送对应的控 制信息， 以实现微小区与宏小区中的用户终端所占用的通信资源在频域中正 交。 在本实施例中， 宏小区和微小区中用户终端的控制信息均由宏基站来协 调发送， 保证控制信息可以同步到达宏小区和微小区中的各用户终端， 且微 基站的覆盖范围完全在宏基站的覆盖范围之内， 则可以确保微小区中的用户 终端可以接收到宏基站的控制信息， 完全避免微小区和宏小区的控制信道之 间的干扰。 需要指出的是， 本实施例中的数据传输方法可以具体适用于微小 区数量较少的场景（如 1-3 个） ， 当微小区的数量较多时， 可以采用现有技 术中啟基站调度微小区的控制信息的传输方式， 此处不再赘述。
另外， 在本实施例中， 为了避免微小区中用户终端的控制信息被宏小区 中的用户终端所误接收， 需要对微小区的控制信道进行适当处理， 如可以利 用微小区的小区编号对其控制信道承载的控制信息进行加扰， 以与宏小区的 控制信道^载的控制信息相区分。 或者， 也可以对宏小区范围内的所有用户 终端进行统一编号处理， 由于微小区中的用户终端也处于宏小区范围内， 则 相当于将宏小区和微小区中的用户终端一起进行统一编号， 此时无论宏小区 中或微小区中的用户终端均具有唯一的一个编号， 则宏基站或微基站在进行 用户终端的调度时不会因不同小区中用户终端的编号相同而引起误接收， 此 时误接收的概率会大大降低， 则无需再进行加扰处理。
在本步骤中， 当进行数据信息的传输时， 本实施例可以由宏基站和微基 站根据用户终端的具体位置来向宏小区与微小区中用户终端发送数据信息。 本步骤具体为当微小区中的用户终端位于微小区的中心区域， 或宏小区中的 用户终端位于所述宏小区的中心区域时， 宏基站和微基站采用相同的发送资 源分别发送所述宏小区中的用户终端和所述微小区中的用户终端的数据信 息， 即宏基站直接采用与宏小区中用户终端的发送资源相同的发送资源来对 微小区中用户终端的数据信息进行发送。 具体可以为宏基站和微基站采用相 同的发送频率分别对宏小区和微小区中的用户终端的数据信息进行发送。 由 于用户终端位于微小区的中心区域时， 微小区的波束强度和宏小区的波束强 度之间的差别较大， 微小区中的用户终端可以直接将宏基站所发送的信号当 作噪声， 因此只需调度微小区本身的波束进行发送即可， 无论在时间上还是 频率上， 微小区中这部分用户终端的发送资源可以和宏小区的发送资源完全 重合。 而用户终端位于宏小区的中心区域时， 宏小区中的用户终端也可以直 接将微基站所发送的信号当作噪声 , 则只需调度宏小区本身的波束进行发送 即可， 无论在时间上还是频率上， 宏小区中这部分用户终端的发送资源也可 以和微小区的发送资源完全重合。 因此， 在本实施例中， 宏基站采用相同的 发送资源来分别传输宏小区和微小区中用户终端的数据信息。 本步骤针对的 场景具体可以为当微小区中的用户终端位于微小区的中心区域， 宏小区中的 用户终端位于宏小区的中心区域时； 或者可以为当微小区中的用户终端位于 微小区的中心区域， 宏小区中的用户终端位于宏小区的边缘区域时； 或者还 可以为当微小区中的用户终端位于微小区的边缘区域， 宏小区中的用户终端 位于宏小区的中心区域时， 均由宏基站和微基站采用相同的发送资源分别发 送所述宏小区中的用户终端和所述微小区中的用户终端的数据信息。
在本步骤中， 当进行数据信息的传输时， 当微小区中的用户终端位于微 小区的边缘区域， 且宏小区中的用户终端位于所述宏小区的边缘区域时， 微 小区中的用户终端与宏小区中的用户终端距离较近， 此时， 无论是宏小区中 的用户终端或微小区中的用户终端， 宏基站和微基站通过宏小区的天线组和 微小区的天线组， 采用统一的码本对宏小区中的用户终端和 /或微小区中的用 户终端的数据信道承载的数据进行联合预编码并发送。 本步骤为宏基站和微 基站对宏小区的天线组和微小区的天线组进行统一调度， 并采用同一套码本 对用户终端的数据信道承载的数据进行联合预编码并发送。 在本实施例中， 宏基站和微基站可以根据具体的调度策略来对各用户终端的数据传输进行统 一调度， 具体地， 本实施例中的数据联合传输的方案可以为宏小区中的用户 终端和微小区中的用户终端的数据同时传输的多用户终端多入多出（Multiple Input Multiple Output; 以下简称： MIMO )方案， 也可以为宏小区中的用户终 端或微小区中的用户终端的数据同时传输的单用户终端 MIMO方案， 也可以 为宏小区中的用户终端或微小区中的用户终端的数据同时传输的多用户终端 MIMO方案。 即可以同时传输宏小区和微小区中的多个用户终端的数据， 可 以同时传输宏小区或微小区中的单个用户终端的数据， 还可以同时传输宏小 区或微小区中的多个用户终端的数据。
具体地， 本实施例中上述步骤中的通过宏小区的天线组和微小区的天线 组， 采用统一的码本对宏小区和 /或微小区中的用户终端的数据信息进行联合 预编码并发送的过程可以具体包括如下步骤： 首先，宏基站或 基站采用统一 的码本将所述宏小区中的用户终端和 /或微小区中的用户终端的数据信道承载 的数据进行预编码， 生成编码数据流， 所述编码数据流的维数与所述码本所容 纳的最大数据流数目相等。 在本实施例中， 假设宏基站的天线组由 M个天线 组成， 而啟基站的天线组由 N个天线组成， 由于宏基站自身的天线组和 基 站的天线组距离较远， 则可以认为是彼此独立的天线， 即总共 M+N个天线， 其中， M和 N均为正整数。 而根据波束赋形的特点， 利用天线阵元组 4艮难在 某一个确定的较小区域内形成多个波束， 因此，微小区中通常采用单波束发送 数据， 凭借其较高的信噪比采用较高的调制方式来实现吞吐量的提升。在本实 施例中， 按照协议中规定的码本所能容纳的最大数据流数目假设为 T, 其中， T为正整数， 且 T小于或等于 M+N, 假设用户终端的数据信道上待传输的数 据流的数目为 L, 其中， L为正整数， 且 L小于或等于 T。 图 4为本发明数据 传输方法实施例二中数据预编码及发送的流程示意图， 如图 4所示， 本实施例 可以采用同一套码本对宏小区和 /或微小区中的用户终端的数据信道上承载的 待传输数据进行预编码， 具体宏基站或微基站可以通过 LxT预编码矩阵对 L 个待传输数据流进行预编码， 以生成 T维编码数据流。 其次， 宏基站或微基站 采用天线转换矩阵将所述编码数据流映射到所述宏小区的天线组和所述微小 区的天线组中的天线上进行发送。 在对待传输数据流进行预编码后， 宏基站或 微基站根据天线转换矩阵， 即矩阵 Τχ (Μ+Ν) , 将 T维预编码后的编码数据流 映射到 M+N个天线上， 利用 M+N个天线对编码数据流进行发送。 其中， 天 线转换矩阵 Τ χ (Μ+Ν)为在（ Μ+Ν )维的 DFT矩阵中抽取 Τ列而得到，当 Τ=Μ+Ν 时， 该天线转换矩阵则为 Τ维的单位矩阵。 在本实施例中， 由宏基站或微基站 将宏小区和微小区中的天线均联合在一起， 将发送能力进行整合， 实现利用宏 小区和微小区的整个资源来发送单个或多个用户终端的数据。
进一步地， 在本实施例中， 对于数据的上行传输来说， 与数据的下行传 输类似， 宏基站也可以将宏小区的天线和微小区的等效波束联合起来对接收 到的数据流进行联合解码。 且由于宏基站和微基站之间通过光纤直连， 则二 者之间几乎不存在时延问题， 则宏基站可以有效地同时将宏小区中的用户终 端和微小区中的用户终端发送的数据进行接收， 再根据小区编号等信息来区 分不同的小区。
在本步骤中， 当所述微小区的用户终端处于微小区的边缘区域时， 采用 相互正交的发送波束分别向所述宏小区的用户终端和微小区的用户终端发送 数据信息， 以避免相互之间造成干扰。 即本实施例中宏基站在对用户终端的 数据进行联合传输时， 还可以根据微小区中的用户终端位置来对宏小区中的 用户终端进行调度， 并传输被调度的用户终端的数据信息。 在传输数据信息 时， 尽量采用与向微小区中的用户终端发送数据信息时使用的波束相正交的 发送波束来向宏小区中的用户终端发送数据信息。 由于微小区的位置相对是 固定的， 则宏基站在调度宏小区中的用户终端时， 可以根据微小区的位置来 进行波束协调， 尽量避免调度微小区方向上的用户终端。 继续参见图 3 , 终 端 1位于微小区的边缘区域， 宏基站在调度宏小区中的用户终端， 即向宏小 区中的用户终端发送数据信息时， 尽量选择与终端 1对应的发送波束相正交 的发送波束来发送数据信息， 即尽量选择调度图中的终端 2, 而不选择调度 图中的终端 3 , 以免干扰微小区中的终端 1。
进一步地， 在本实施例中， 当宏基站进行多用户传输时， 可以直接让微小 区中的用户终端占用单独的一维空间。 如果存在两个微小区， 且这两个微小 区相距较近， 则旁瓣或会对相邻微小区产生干扰， 此时可以由宏基站对这两 个微小区统一进行调度， 一个简单的做法可以先关闭其中一个微小区， 在时 间上或者频率上分开发送。
需要注意的是， 当宏小区内的微小区多于一个时， 本实施例中的联合传 输过程只能由其中一个微小区和宏小区一起进行， 这是由于当宏小区与某一 微小区的联合传输方式， 包括预编码方式、 资源块信息确定之后， 已经缺少 和其他微小区继续进行联合传输的可能性， 但不排除仍有和其他微小区进行 波束协调的可能性。
步骤 205 , 用户终端根据接收到的控制信息获取对应的数据信息。
当位于宏小区或微小区中的用户终端接收到基站发送的控制信息后，通 过对控制信息进行解析， 获取到控制信息所指示的子载波信息、信道信息等。 该步骤为本领域技术人员所熟悉的技术， 在此不再赘述。
本实施例提供了一种数据传输方法， 通过将微基站与宏基站设置为共站 址， 由宏基站和微基站对用户终端进行统一协调调度， 根据用户终端的位置 信息来向宏小区和微小区的用户终端发送控制信息以及数据信息， 以实现宏 基站和微基站对用户终端的信息的联合传输， 实现了宏基站与微基站之间对 用户终端的通信资源的联合调度， 解决了现有技术中各基站间无法实施联合 传输所造成的系统容量提升受限的缺陷， 打破了回传能力的限制和同步要求 的限制， 从而降低了小区间干扰， 最大限度地提高了总体的数据率。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤可 以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读取存 储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储 介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介质。 本实施例提供了一种数据传输系统，可以具体执行上述方法实施例一中的 各个步骤， 此处不再赘述。 本实施提供的数据传输系统可以应用于采用虚拟多 层小区结构的系统架构， 其中， 覆盖宏小区的宏基站与覆盖微小区的微基站共 站址。 本实施提供的数据传输系统可以具体包括发送模块。 其中， 发送模用于 根据用户终端的位置信息向所述宏小区和所述微小区的用户终端发送控制信 息和数据信息， 使得所述用户终端根据所述控制信息获取所述数据信息。
图 5为本发明数据传输系统实施例的结构示意图， 如图 5所示， 本实施 例提供了一种数据传输系统，可以具体执行上述方法实施例二中的各个步骤， 此处不再赘述， 本实施提供的数据传输系统中的发送模块 501可以具体包括 第一发送单元 51 1和第二发送单元 521。 其中， 第一发送单元 51 1用于采用 第一发送频谱向宏小区中的用户终端发送对应的控制信息。 第二发送单元 521 , 用于采用第二发送频谱向微小区中的用户终端发送对应的控制信息。 其 中， 所述第一发送频媒和所述第二发送频媒相互正交。
具体地， 本实施例提供的数据传输系统中的发送模块 501还可以具体包 括第三发送单元 531 , 第三发送单元 531 用于当所述微小区中的用户终端位 于所述微小区的中心区域， 或所述宏小区中的用户终端位于所述宏小区的中 心区域时， 采用相同的发送资源分别发送所述宏小区中的用户终端和所述啟 小区中的用户终端的数据信息。
进一步地， 本实施例提供的数据传输系统中的发送模块 501还可以包括 第四发送单元 541 , 第四发送单元 541用于当所述微小区中的用户终端位于 所述微小区的边缘区域， 且所述宏小区中的用户终端位于所述宏小区的边缘 区域时， 通过所述宏小区的天线组和所述微小区的天线组， 采用统一的码本 对所述宏小区和 /或微小区中的用户终端的数据信息。
进一步地， 本实施例提供的数据传输系统中的第四发送单元 541可以具 体包括预编码子单元 541 1和发送子单元 5412。 其中， 预编码子单元 541 1用 于采用相同的码本将所述宏小区和 /或微小区中的用户终端的数据信息进行 预编码， 生成编码数据流， 所述编码数据流的维数与所述码本所容纳的最大 数据流数目相等。发送子单元 5412用于采用天线转换矩阵将所述编码数据流 映射到所述宏小区的天线组和所述微小区的天线组中的天线上进行发送。
进一步地， 本实施例提供的数据传输系统中的发送模块 501还可以包括 第五发送单元 551 , 第五发送单元 551用于当所述微小区的用户终端处于微 小区的边缘区域时， 采用相互正交的发送波束分别向所述宏小区的用户终端 和微小区的用户终端发送数据信息。
更进一步地， 本实施例提供的数据传输系统还可以包括调整模块 502 , 调整模块 502用于根据所述宏小区和 /或所述微小区中的负载情况对所述微小 区的中心区域与边缘区域之间的分界线进行调整。 具体调整方法可以参见上 述方法实施例中的相关步骤， 在此不再赘述。
更进一步地，本实施例提供的数据传输系统还可以包括获取调度模块 503 , 获取调度模块 503 用于获取所述宏小区和所述微小区的用户终端的通信状态 信息， 以根据所述通信状态信息对所述用户终端的通信资源进行统一调度。
本实施例提供了一种数据传输系统， 通过将微基站与宏基站设置为共站 址， 由宏基站和微基站对用户终端进行统一调度， 根据用户终端的位置信息 来向宏小区和微小区的用户终端发送控制信息以及数据信息， 以实现宏基站 和微基站对用户终端的信息的联合传输， 实现了宏基站与微基站之间对用户 终端的通信资源的联合调度， 解决了现有技术中各基站间无法实施联合处理 所造成的系统容量提升受限的缺陷， 打破了回传能力的限制和同步要求的限 制， 从而降低了小区间干扰， 最大限度地提高了总体的数据率。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对 其限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通 技术人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修 改， 或者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要 求
1、 一种数据传输方法， 其特征在于， 应用于采用虚拟多层小区结构的系 统架构， 其中， 覆盖宏小区的宏基站与覆盖微小区的微基站共站址， 所述方 法包括如下步骤：
根据用户终端的位置信息向所述宏小区和所述微小区的用户终端发送控 制信息和数据信息，使得所述用户终端根据所述控制信息获取所述数据信息。
2、 根据权利要求 1所述的方法， 其特征在于， 所述根据用户终端的位置 信息向所述宏小区和所述微小区的用户终端发送控制信息包括：
采用第一发送频谱向宏小区中的用户终端发送对应的控制信息， 采用第 二发送频谱向微小区中的用户终端发送对应的控制信息， 所述第一发送频媒 和所述第二发送频媒相互正交。
3、 根据权利要求 1或 2所述的方法， 其特征在于， 根据用户终端的位置 信息向所述宏小区和所述微小区的用户终端发送数据信息包括：
当所述微小区中的用户终端位于所述微小区的中心区域， 或所述宏小区 中的用户终端位于所述宏小区的中心区域时， 采用相同的发送资源分别发送 所述宏小区中的用户终端和所述微小区中的用户终端的数据信息。
4、 根据权利要求 1或 2所述的方法， 其特征在于， 根据用户终端的位置 信息向所述宏小区和所述微小区的用户终端发送数据信息包括：
当所述微小区中的用户终端位于所述微小区的边缘区域， 且所述宏小区 中的用户终端位于所述宏小区的边缘区域时， 通过所述宏小区的天线组和所 述微小区的天线组， 采用统一的码本对所述宏小区和 /或所述微小区中的用户 终端的数据信息进行联合预编码并发送。
5、 根据权利要求 4所述的方法， 其特征在于， 所述通过所述宏小区的天 线组和所述微小区的天线组， 采用统一的码本对所述宏小区和 /或所述微小区 中的用户终端的数据信息进行联合预编码并发送包括： 采用统一的码本将所述宏小区和 /或所述微小区中的用户终端的数据信 息信进行预编码， 生成编码数据流， 所述编码数据流的维数与码本所容纳的 最大数据流数目相等；
采用天线转换矩阵将所述编码数据流映射到所述宏小区的天线组和所述 微小区的天线组中的天线上进行发送。
6、 根据权利要求 1或 2所述的方法， 其特征在于， 根据用户终端的位置 信息向所述宏小区和所述微小区的用户终端发送数据信息包括：
当所述微小区的用户终端处于微小区的边缘区域时， 采用相互正交的发送 波束分别向所述宏小区的用户终端和所述啟小区的用户终端发送数据信息。
7、 根据权利要求 1所述的方法， 其特征在于， 还包括：
获取所述宏小区和所述微小区的用户终端的通信状态信息， 以根据所述 通信状态信息对所述用户终端的通信资源进行统一调度。
8、 根据权利要求 1所述的方法， 其特征在于， 还包括：
根据所述宏小区和 /或所述微小区中的负载情况对所述微小区的中心区 域与边缘区域之间的分界线进行调整。
9、 一种数据传输系统， 其特征在于， 应用于采用虚拟多层小区结构的系 统架构， 其中， 覆盖宏小区的宏基站与覆盖微小区的微基站共站址， 所述数 据传输系统包括：
发送模块， 用于根据用户终端的位置信息向所述宏小区和所述微小区的 用户终端发送控制信息和数据信息 , 使得所述用户终端根据所述控制信息获 取所述数据信息。
10、 根据权利要求 9所述的系统， 其特征在于， 所述发送模块包括： 第一发送单元， 用于采用第一发送频谱向宏小区中的用户终端发送对应 的控制信息；
第二发送单元， 用于采用第二发送频谱向微小区中的用户终端发送对应 的控制信息； 其中， 所述第一发送频谱和所述第二发送频媒相互正交。
11、根据权利要求 9或 10所述的系统，其特征在于，所述发送模块包括： 第三发送单元， 用于当所述 小区中的用户终端位于所述啟小区的中心区 域， 或所述宏小区中的用户终端位于所述宏小区的中心区域时， 采用相同的发送 资源分别发送所述宏小区中的用户终端和所述微小区中的用户终端的数据信息。
12、根据权利要求 9或 10所述的系统，其特征在于，所述发送模块包括： 第四发送单元， 用于当所述微小区中的用户终端位于所述微小区的边缘 区域， 且所述宏小区中的用户终端位于所述宏小区的边缘区域时， 通过所述 宏小区的天线组和所述微小区的天线组， 采用统一的码本对所述宏小区和 /或 所述微小区中的用户终端的数据信息进行联合预编码并发送。
13、根据权利要求 12所述的系统，其特征在于，所述第四发送单元包括： 预编码子单元， 用于采用相同的码本将所述宏小区和 /或所述微小区中的 用户终端的数据信息进行预编码， 生成编码数据流， 所述编码数据流的维数 与码本所容纳的最大数据流数目相等；
发送子单元， 用于采用天线转换矩阵将所述编码数据流映射到所述宏小 区的天线组和所述微小区的天线组中的天线上进行发送。
14、 根据权利要求 12所述的系统， 其特征在于， 所述发送模块包括： 第五发送单元，用于当所述微小区的用户终端处于微小区的边缘区域时， 采用相互正交的发送波束分别向所述宏小区的用户终端和所述微小区的用户 终端发送数据信息。
15、 根据权利要求 9所述的系统， 其特征在于， 还包括：
调整模块， 用于根据所述宏小区和 /或所述微小区中的负载情况对所述微 小区的中心区域与边缘区域之间的分界线进行调整。
16、 根据权利要求 9所述的系统， 其特征在于， 还包括：
获取调度模块， 用于获取所述宏小区和所述微小区的用户终端的通信状 态信息，以根据所述通信状态信息对所述用户终端的通信资源进行统一调度。
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